compositions



I06. COMPOSITIONS,

' COATING OR'PLASTIC.

) 15 only applicable for ordinary purposess uch treated are then round to a fine owder which 3 5 is mixed with Ede remalnin'g portion oi cemthrou h the mass b meansdfanainpl fi 50 of Her apparatus placed under the FerforaIied Cms Reference UNI ED: STATES PATENT ()FFICE.

LOUIS ROSENTHAII, OF 'FRANKFORT-ON THE-MAIN, GERMANY.-

MAKING ARTIFICIAL BLocKs, STONES, aw,

SPECIFICATION forming part Of Letters Patent NO. 298,505, dated ma 13, 1884-.

To all whom it may concern.- Be it known that I, Louis RQSENTHAL, a subject of the Emperor of Germany, and residing at Frankfort-on-the-"Ilain, Germany, have 5 invented new and useful Improvements in Making Artificial Blocks,Stones, and the Like, especially Artificial Lithographic Stones, of which the following is a specification. Among the great disadvantages that artifiro cial stones made from cement possess is foremost the cracking of the material in harden ing in consequence of shrinkage. This difliculty is partly overcome by mixing the cement with sand; but the resulting product is as plastering walls, making building-blocks, f, &c.-b'fitfiY)tfir:sl1IaTcs:tfiatafieWp6I- E ished re'ive a ne .firifiifeisltneyuv' 'e hardness of the sin'c m ents givingthe surface apjjrolishl, a V

The object of my invention is to provide a new and improved artificial stone devoidof the above-mentioned defects.

I'n carrying out my invention I proceed as follows: One-half, or more or less gflz l i e qgan tity of cememfn'senfs'fiad e ln o .a'.})3hQ.-With wafdfi Warinrarnie megg re hard'e' 'nedas qmcEIy as POSSIEIG, 1i necessary, by manner heWE-fcretheplates arenasand again heated, and so on until they are full o'fcrackswwifigtdthe sudden changes in the temperature. The plates thus prepared and cut toform a pasteor mortar. If desired, owdered carbonate. o,-li be used in p ace 0 e'p'ow er 0 name from the hardened cement'plates.. The paste is cast or ressed into a mold of any desire s ape mi and divided into two compartments by a perforated plate placed horizontally,. and covered with a linen cloth. On this plate the material is permitted to dry,

5 and is'then subjected to a pa 'epifl nctl atmospheres. A sufficient quantity 0 ya er 15 i l v r u e mass to produce a hardening o te mass, and this water is sucked Application filed March 25, 1884. (No special ens.)

plate. By this operation all the air is exelled from the mass and replaced Iii: Ede "Ed 1d. This mass'is then agaln su ec e o a pregure of twenty atmospheres, by which the exec of water and b constant fitmbn hardenin 1s revented until AEILQIEHQJ$-EE me'd'" m 10 as Ede appearance QLfineIy-slaked IlllCIOSOOPlOfiIIY-SHW a'pertures in the block cement contained in the water. This manipulation may be repeated as often as is necessary after the block has become dry.

Stones thus prepared are equal in quality to the natural lithographic stone, and the lines produced by means of the same are sharper and clearer than the lines produced by nat-= ural lithographic stones. I

The above-described stone does not absorb ,water. It can be polished to a certain degree, and requires no treatment in regard to the application of colors. It can be molded into any suitable shape, such as rollers, slabs, &c.

The ordinary cement can be mixed with the powdered hardened cement or carbonate of 8 5 lime before making the paste; or the powdered hardened cement or the carbonate of lime can be mixed with the cement-paste before the same has become set. If the mass is to have a white or whitish color,the carbonate of lime is used.

Having thus described my invention, and the manner of employing the same, I claim 1. The preparation, as herein described, of a cast mass of cement made by mixing fresh 5 unset cement. with an equal quantity, or rather more, of cement which has already become hardened, (set,) or of finely-ground carbonate of lime, which mass is free from cracks or faults.

lime, and then the wat 'r which holds th solubleartsnoi t5 ecemenfiiii solution- 1S ddawn O l J, fied and hardened stone, and tlie re'bTtH e nTo's'E' are filled in by the soluble constituents of the 2. The preparation of artificial lithographic stones or rollers from cement by mixing unset cement with about an equal quantity of alreadyset cement finely powdered,or, in lieu thereof,

5 with finely-powdered carbonate of lime, then drying this mixture, pressing it together under a high pressure, sucking a quantity of water necessary for its hardening or setting through it, and finally again subjecting the moist mass to a high pressure, substantially as herein specified.

vThe impregnation of cement stones, rollother formed objects with a liquid satwith the alkaline and soluble constit- LOUIS ROSENTH AL.

\Vitnesses:

FRANZ HASSLACHER, JosEPH PATRICK. 

